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GM317 の電気的特性と機能

GM317のメーカーはGamma Microelectronicsです、この部品の機能は「ADJUSTABLE REGULATOR」です。


製品の詳細 ( Datasheet PDF )

部品番号 GM317
部品説明 ADJUSTABLE REGULATOR
メーカ Gamma Microelectronics
ロゴ Gamma Microelectronics ロゴ 




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GM317 Datasheet, GM317 PDF,ピン配置, 機能
www.DataSheet4U.com
AA
MICROELECTRONICS
Power Management
GM317
3- TERMINAL ADJUSTABLE REGULATOR
Description
The GM317 is an adjustable 3-terminal positive voltage reg-
ulator capable of supplying in excess of 1.5 A over an out-
put voltage range of 1.2 V to 37 V. This voltage regulator is
exceptionally easy to use and requires only two external re-
sistors to set the output voltage. Further, it employs internal
current limiting, thermal shutdown and safe area compen-
sation, making it essentially blow-out proof.
The GM317 a wide variety of applications including local,
application, and on card regulation. This device can also
be used to make a programmable output regulator, or by
connecting a fixed resistor between the adjustment and out-
put. The GM317 can be used as a precise current regula-
tor.
Features
Output current up to 1.5A
Output Voltages 1.2V to 37V
Input Regulation typ. 0.01% per input
Output Regulation typ. 0.1%
Peak Output Current Constant over
Temperature Range of Regulator
Available in TO-220 and TO-263 Packages
Ripple Rejection Typically 80dB
Direct replacements for LM317
TYPICAL APPLICATION
VIN
CIN*
0.1µF
GM317
VIN VOUT
ADJ
IADJ
R2
VOUT
R1
240W
+ CO**
1µF
* CIN is required if regulator is located an appreciable distance from power supply filter.
**CO is not needed for stability, however, it improve transient response.
VOUT= 1.25V (1+
R2
R1
) + IADJR2
Since IADJ is controlled to less than 100µA, the error associated with this term is negligible
in most applications.
www.gammamicro.com 1
PRELIMINARY

1 Page





GM317 pdf, ピン配列
AA
MICROELECTRONICS
Power Management
GM317
3- TERMINAL ADJUSTABLE REGULATOR
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input to Output Differential Voltage, VI - VO
Continuous Total Dissipation at 25°C free-air temperature
Continuous Total Dissipation at (or bellow) 25°C case temperature
Operating free-air, case, or virtual junction Temperature Range
Storage Temperature Range
Lead Temperature 1.6mm (1/16 inch) from case for 10 sec.
VALUE
40
2
15
0 to +125
-65 to +150
260
UNIT
V
W
°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Output Current, IO
Operating virtual junction temperature, TJ
MIN
MAX
UNIT
10
1500
mA
0 125 °C
SCHEMATIC DIAGRAM
31 310
230 120
5.6K
125K
12.4K
135
6.3V
5.8K
5.1K
190 110
3.6K
30
30 pF 2.4K
pF
12.5K
170
6.7K
5pF
12K
510
160
6.8K
200
VIN
6.3V
13K
6.3V
105
4.0
VOUT
This device contains 29 active transistors.
ADJ
3


3Pages


GM317 電子部品, 半導体
AA
MICROELECTRONICS
Power Management
GM317
3- TERMINAL ADJUSTABLE REGULATOR
APPLICATION INFORMATION
Basic Circuit Operation
The GM317 is a 3- terminal floating regulator. In opera-
tion, the GM317 develops and maintains a nominal
1.25V reference (Vref) between its output and adjust-
ment terminals. This reference voltage is converted to
a programming current flows through R2 to ground.
The regulated output voltage is given by:
VOUT= Vref (1+
R2
R1
) + IADJ R2
Since the current from the adjustment terminal (IADJ)
represents an error term in the equation, the GM317
was designed to control IADJ to less than 100µA and
keep it constant. To do this, all quiescent operating cur-
rent is returned to the output terminal. This imposes
the requirement for a minimum load current. If the load
current is less than this minimum, the output voltage
will rise.
External Capacitors
A 0.1µF disc or 1.0µF tantalum input bypass capaci-
tor (CIN) is recommended to reduce the sensitivity to
input line impedance.
The adjustment terminal may be bypassed to
ground to improve ripple rejection. This capacitor
(CADJ) prevents ripple from being amplified as the
output voltage is increased. A 10µF capacitor should
improve ripple rejection about 15 dB at 120Hz in a
10V application.
Although the GM317 is stable with no output capaci-
tance, like any feedback circuit, certain values of ex-
ternal capacitance can cause excessive ringing. An
output capacitance (CO) in the form of a 1.0µF tanta-
lum or 25µF aluminum electrolytic capacitor on the
output swamps this effect and insures stability.
Since the GM317 is a floating regulator, it is only the
voltage differential across the circuit which is important
to performance, and operation at high voltages with re-
spect to ground is possible.
Protection Diodes
When external capacitors are used with any IC regu-
lator it is sometimes necessary to add protection di-
odes to prevent the capacitors from discharging
through low current points into the regulator.
VIN
GM317
VOUT
VOUT
Adjust
IADJ
Vref= 1.25V Typical
Vref R1
IPROG
R2 VOUT
Figure 9. shows the GM317 with the recommended
protection diodes for output for output voltage in ex-
cess of 25Vor high capacitance values (CO > 25µF,
CADJ > 10µF). Diode D1 prevents CO from discharg-
ing thru the IC during an input short circuit. Diode D2
protects against capacitor CADJ discharging through
the IC during an output short circuit.
Figure 8. Basic Circuit Configuration
The combination of diodes D1 and D2 prevents
Load Regulation
The GM317 is capable of providing extremely good
load regulation, but a few precautions are needed to ob-
CADJ from discharging through the IC during an in-
put short circuit.
D1
tain maximum performance. For best performance, the
programming resistor (R1) should be connected as
close to the regulator as possible to minimize line
drops which effectively appear in series with the refer-
ence, thereby degrading regulation. The groung end of
VIN
CIN
1N4002
GM317
Adjust
VOUT
R1
D2 + CO
1N4002
R2 can be returned near the load ground to provide re-
mote ground sensing and improve load regulation.
6
R2 CADJ
Figure 9. Voltage Regulator with Protection Diodes

6 Page



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